Demos/Device/ClassDriver/USBtoSerial/USBtoSerial.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2009.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, and distribute this software
  13   and its documentation for any purpose and without fee is hereby
  14   granted, provided that the above copyright notice appear in all
  15   copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \file
  32  *
  33  *  Main source file for the USBtoSerial demo. This file contains the main tasks of
  34  *  the demo and is responsible for the initial application hardware configuration.
  35  */
  36
  37 #include "USBtoSerial.h"
  38
  39 /** Circular buffer to hold data from the host before it is sent to the device via the serial port. */
  40 RingBuff_t Rx_Buffer;
  41
  42 /** Circular buffer to hold data from the serial port before it is sent to the host. */
  43 RingBuff_t Tx_Buffer;
  44
  45 /** LUFA CDC Class driver interface configuration and state information. This structure is
  46  *  passed to all CDC Class driver functions, so that multiple instances of the same class
  47  *  within a device can be differentiated from one another.
  48  */
  49 USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
  50         {
  51                 .Config =
  52                         {
  53                                 .ControlInterfaceNumber     = 0,
  54
  55                                 .DataINEndpointNumber       = CDC_TX_EPNUM,
  56                                 .DataINEndpointSize         = CDC_TXRX_EPSIZE,
  57
  58                                 .DataOUTEndpointNumber      = CDC_RX_EPNUM,
  59                                 .DataOUTEndpointSize        = CDC_TXRX_EPSIZE,
  60
  61                                 .NotificationEndpointNumber = CDC_NOTIFICATION_EPNUM,
  62                                 .NotificationEndpointSize   = CDC_NOTIFICATION_EPSIZE,
  63                         },
  64         };
  65
  66 /** Main program entry point. This routine contains the overall program flow, including initial
  67  *  setup of all components and the main program loop.
  68  */
  69 int main(void)
  70 {
  71         SetupHardware();
  72
  73         Buffer_Initialize(&Rx_Buffer);
  74         Buffer_Initialize(&Tx_Buffer);
  75
  76         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  77
  78         for (;;)
  79         {
  80                 /* Read bytes from the USB OUT endpoint into the USART transmit buffer */
  81                 for (uint8_t DataBytesRem = CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface); DataBytesRem != 0; DataBytesRem--)
  82                 {
  83                         if (!(BUFF_STATICSIZE - Rx_Buffer.Elements))
  84                           break;
  85
  86                         Buffer_StoreElement(&Rx_Buffer, CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface));
  87                 }
  88
  89                 /* Read bytes from the USART receive buffer into the USB IN endpoint */
  90                 if (Tx_Buffer.Elements)
  91                   CDC_Device_SendByte(&VirtualSerial_CDC_Interface, Buffer_GetElement(&Tx_Buffer));
  92
  93                 /* Load bytes from the USART transmit buffer into the USART */
  94                 if (Rx_Buffer.Elements)
  95                   Serial_TxByte(Buffer_GetElement(&Rx_Buffer));
  96
  97                 CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
  98                 USB_USBTask();
  99         }
 100 }
 101
 102 /** Configures the board hardware and chip peripherals for the demo's functionality. */
 103 void SetupHardware(void)
 104 {
 105         /* Disable watchdog if enabled by bootloader/fuses */
 106         MCUSR &= ~(1 << WDRF);
 107         wdt_disable();
 108
 109         /* Disable clock division */
 110         clock_prescale_set(clock_div_1);
 111
 112         /* Hardware Initialization */
 113         Serial_Init(9600, false);
 114         LEDs_Init();
 115         USB_Init();
 116 }
 117
 118 /** Event handler for the library USB Connection event. */
 119 void EVENT_USB_Device_Connect(void)
 120 {
 121         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 122 }
 123
 124 /** Event handler for the library USB Disconnection event. */
 125 void EVENT_USB_Device_Disconnect(void)
 126 {
 127         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 128 }
 129
 130 /** Event handler for the library USB Configuration Changed event. */
 131 void EVENT_USB_Device_ConfigurationChanged(void)
 132 {
 133         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 134
 135         if (!(CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface)))
 136           LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 137 }
 138
 139 /** Event handler for the library USB Unhandled Control Request event. */
 140 void EVENT_USB_Device_UnhandledControlRequest(void)
 141 {
 142         CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
 143 }
 144
 145 /** ISR to manage the reception of data from the serial port, placing received bytes into a circular buffer
 146  *  for later transmission to the host.
 147  */
 148 ISR(USART1_RX_vect, ISR_BLOCK)
 149 {
 150         uint8_t ReceivedByte = UDR1;
 151
 152         if (USB_DeviceState == DEVICE_STATE_Configured)
 153           Buffer_StoreElement(&Tx_Buffer, ReceivedByte);
 154 }
 155
 156 /** Event handler for the CDC Class driver Line Encoding Changed event.
 157  *
 158  *  \param[in] CDCInterfaceInfo  Pointer to the CDC class interface configuration structure being referenced
 159  */
 160 void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
 161 {
 162         uint8_t ConfigMask = 0;
 163
 164         switch (CDCInterfaceInfo->State.LineEncoding.ParityType)
 165         {
 166                 case CDC_PARITY_Odd:
 167                         ConfigMask = ((1 << UPM11) | (1 << UPM10));
 168                         break;
 169                 case CDC_PARITY_Even:
 170                         ConfigMask = (1 << UPM11);
 171                         break;
 172         }
 173
 174         if (CDCInterfaceInfo->State.LineEncoding.CharFormat == CDC_LINEENCODING_TwoStopBits)
 175           ConfigMask |= (1 << USBS1);
 176
 177         switch (CDCInterfaceInfo->State.LineEncoding.DataBits)
 178         {
 179                 case 6:
 180                         ConfigMask |= (1 << UCSZ10);
 181                         break;
 182                 case 7:
 183                         ConfigMask |= (1 << UCSZ11);
 184                         break;
 185                 case 8:
 186                         ConfigMask |= ((1 << UCSZ11) | (1 << UCSZ10));
 187                         break;
 188         }
 189
 190         UCSR1A = (1 << U2X1);
 191         UCSR1B = ((1 << RXCIE1) | (1 << TXEN1) | (1 << RXEN1));
 192         UCSR1C = ConfigMask;
 193         UBRR1  = SERIAL_2X_UBBRVAL((uint16_t)CDCInterfaceInfo->State.LineEncoding.BaudRateBPS);
 194 }